> RAID5 is slow on writing. Use Raid 1. OK. In a system with four drives, what is the best configuration?
4 x SCSI 15k RPM drives Two internal RAID channels. Split hard drive backplane (2 disks on each channel) A) mirror disks 0 & 1 mirror disks 2 & 3 for two RAID 1 container B) stripe disks 0 & 1 stripe disks 2 & 3 mirror container 1 with container 2 for one RAID1 container C) - ?? Also, on a system with hardware RAID and a single container (OS sees one disk): I'm viewing perf counters like this: Physical disk Disk writes/sec: min: 5 max:101 average: 34 Disk reads/sec: min: 0 max: 25 average: 2 Current disk queue length: min: 0 max: 12 average: 3 The above is a small sample, and *not* done during peak load. I know a long running sample over the entire day would be better, and we'll do that, but I was curious what the consensus from the group was on this information. Are those the right counters to watch? If so, those numbers look high to me, but are they really? What would be an indication of disk bottleneck? I've read that a queue longer than double the number of disks (which is physically 3, but only 1 seen by the OS since it is hardware RAID) indicates a bottleneck - and this number is jumping up around 10-12 on my small samples. tia bk --- [This E-mail scanned for viruses by Declude Virus] To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
